Friction Disks on doors

[PG <britishcars@shaw.ca>]

On the later model Healey, there was a mechanism to hold the door open when
ajar.



Part of this mechanism included a "friction disk" that was between two
pieces of metal that tightened as the door opened (actually quite simple and
ingenious..)



Does anybody know what material of the friction disk was made out of.I need
to make some replicas.



Thanks



Paul